Value of a model?

We are *finally* getting down to the business of building our TTT. We have decided, now that we've finalized our plans, to build a scale model, including all components, etc., and wanted to get a sense of the value of this added step.
Anyone want to weigh in on this? Will it uncover process hiccups like we think, or is it a futile exercise that will not give us *any* idea of the process we're about to undertake.
Thanks in advance.
Anyone want to weigh in on this? Will it uncover process hiccups like we think, or is it a futile exercise that will not give us *any* idea of the process we're about to undertake.

Thanks in advance.